CN113904096B - Miniaturized anti-interference antenna array - Google Patents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/526—Electromagnetic shields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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Abstract
The invention discloses a miniaturized anti-interference antenna array, which comprises a conical missile-borne structural body, wherein a circular truncated cone in the middle of the conical missile-borne structural body is an array distribution area of an active antenna array, and the active antenna array integrates multifunctional devices comprising an antenna radiator, an antenna radiation patch, an antenna feed network board, a low-noise discharge PCB (printed circuit board), a shielding case, an antenna housing and a metal pressing block, so that the physical size of the active antenna array is reduced, the integration level is increased, and the antenna performance is improved; the active antenna array adopts a 3+1 arrangement form to be installed on the conical missile-borne structure body and is in conformal design with the surface of the conical missile-borne structure body, the space range required by the arrangement of the active antenna array under the structure is effectively reduced, the problem that the anti-interference antenna array under the conical missile-borne structure needs to be selected in a self-adaptive mode due to carrier shielding is solved or partially solved, and the active antenna array has profound significance for researching the arrangement mode under similar application scenes.
Description
Technical Field
The invention relates to the technical field of antenna arrays, in particular to a miniaturized anti-interference antenna array.
Background
With the continuous improvement of the Beidou satellite navigation system and the gradual maturity of the satellite application technology in China, the technical field of the antenna array is also continuously innovated. The anti-interference antenna array technology is also more and more widely applied, application scenes are also more and more diversified, complicated and miniaturized, great challenges are brought to the realization of the performance of the anti-interference antenna array, and meanwhile, along with the increase of the complexity of the installation and application scenes, the influence of the single antenna array on the performance of the anti-interference antenna is gradually deepened. Especially for the anti-interference requirements put forward in various narrow spaces or unconventional structures, the requirements on the performance of the antenna single array and the arrangement form are extremely strict, so that the guarantee of the performance of the anti-interference antenna in the unconventional environments such as compactness and asymmetry becomes a scientific research technology with huge potential.
In all anti-interference algorithms, the antenna array radiation pattern is an ideal hemisphere, and the far-field performance of each array is completely consistent. Due to the existence of structural asymmetry, mutual coupling effect and other factors, the various arrays in the array cannot be completely equivalent to a state with consistent amplitudes under an ideal condition. In a more serious situation, due to the shielding condition of some structures on the antenna array, the depth and the alignment direction of the null have to be improved by means of self-adaptive array selection in an anti-interference algorithm, the calculation complexity is increased, and the difficulty in realizing a formula is improved. For a common antenna array, the anti-interference performance of the antenna array is mainly determined by an antenna array, an array arrangement mode and an installation structure environment, and due to the existence of coupling among the antenna arrays, when the antenna array is designed, a part of the coupling effect among the arrays needs to be balanced through the array arrangement form and the installation structure characteristics, so that the compensation or correction effect on the consistency among the arrays is achieved, and the design difficulty is increased for the antenna design.
Disclosure of Invention
The invention aims to provide a miniaturized anti-interference antenna array and solve the problem that in practical application, the anti-interference antenna array space is insufficient under a conical missile-borne compact structure.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a miniaturized anti-interference antenna array comprises a conical missile-borne structure body, wherein a circular truncated cone in the middle of the conical missile-borne structure body is an active antenna array distribution area, the upper half part of a horizontal tangent line of the axis of the circular truncated cone is provided with 3 active antenna arrays arranged in an isosceles triangle shape, the lower half part of the horizontal tangent line of the axis of the circular truncated cone is provided with 1 active antenna array, 4 active antenna arrays are all arranged on the conical missile-borne structure body and are in conformal design with the outer surface of the conical missile-borne structure body, each active antenna array comprises a shielding cover fixed on the conical missile-borne structure body in an inverted convex shape and an antenna housing positioned above the shielding cover in a convex shape, an antenna feed network board is arranged between the shielding cover and the antenna housing, a low-noise PCB is arranged in the shielding cover, the upper surface of the low-noise PCB is welded and connected with the lower surface of the antenna feed network board, the antenna house bottom center is opened there is the cross section to be the groove of square and the inseparable antenna radiator that is provided with of inslot, the cuboid of antenna radiator for sinking into the inslot completely, antenna radiator upper portion surface is provided with the antenna radiation paster, coplanar design is taken with conical missile-borne structure body surface in antenna house upper portion, two minor face departments fluting of antenna house and fluting department are provided with metal briquetting, antenna house, antenna feed network board are fixed in on the conical missile-borne structure body through screw and housing together.
The technical scheme of the invention is further improved as follows: the radius of the upper table surface of the circular table is 41.3mm, the radius of the lower table surface of the circular table is 54.5mm, and the height between the upper table surface and the lower table surface of the circular table is 55 mm.
The technical scheme of the invention is further improved as follows: the utility model discloses a round platform, including round platform axis, 3 active antenna arrays that the horizontal tangent line of round platform axis upper half set up are first active antenna array, second active antenna array and third active antenna array respectively, the third active antenna array is placed in being close to the mesa position, first active antenna array and second active antenna array are placed in being close to mesa position down, the projection of the angle that the main radiation direction of first active antenna array and second active antenna array formed on the round platform cross section becomes 90 right angles, first active antenna array and second active antenna array are placed about round platform axis symmetry.
The technical scheme of the invention is further improved as follows: the active antenna array that the horizontal tangent line latter half of round platform axis set up is fourth active antenna array, fourth active antenna array and third active antenna array longitudinal symmetry place, the projection of the angle that fourth active antenna array and the main radiation direction of third active antenna array formed on the round platform longitudinal section becomes 29.2.
The technical scheme of the invention is further improved as follows: and the probe at the input end of the antenna feed network board is welded at a welding hole position reserved on the low-noise amplifier PCB.
The technical scheme of the invention is further improved as follows: four sides of the antenna radiation patch are respectively grooved, the grooves on two groups of parallel sides are respectively symmetrical grooves, and the grooves on two mutually perpendicular sides are asymmetrical grooves.
The technical scheme of the invention is further improved as follows: the antenna radiation patch is provided with a plurality of feed pins which are positioned on a circle with the center of the antenna radiation patch as the center of a circle and equal radius, the angle of a sector area swept by the center of the antenna radiation patch and the positions of any two adjacent feed pins is 90 degrees, and meanwhile, the center of the antenna radiation patch and the connecting line of any feed pin are respectively vertical to the corresponding edge of the antenna radiation patch.
The technical scheme of the invention is further improved as follows: the antenna feed network board adopts a 3dB bridge designed by microstrip lines, the output signals of the output ports are orthogonal signals with equal amplitude and 90-degree phase difference, and the signals are transmitted to the antenna radiation patch through the feed pins to form 90-degree orthogonal equal-amplitude signals on the surface of the antenna radiation patch.
The technical scheme of the invention is further improved as follows: the dielectric constant of the antenna radiator medium is 22.
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. the active antenna array integrates multifunctional devices including an antenna radiator, an antenna radiation patch, an antenna feed network board, a low-noise discharge PCB (printed circuit board), a shielding case, an antenna housing and a metal pressing block, so that the physical size of the active antenna array is reduced, the integration level is increased, and the antenna performance is improved; the active antenna array is arranged on the conical missile-borne structure body in a 3+1 arrangement mode and is designed to be conformal with the surface of the conical missile-borne structure body, the space range required by the arrangement of the active antenna array under the structure is effectively reduced, the problem that the anti-interference antenna array under the conical missile-borne structure needs to be selected in a self-adaptive mode due to carrier shielding is solved or partially solved, and the active antenna array has far-reaching significance for the research of the arrangement mode under similar application scenes;
2. the active antenna array on the conical missile-borne structure body adopts a 3+1 arrangement form, the arrangement form takes a horizontal plane passing through a rotational symmetry axis of the conical missile-borne structure body as a boundary, the front surface of the upper half part comprises 3 antenna arrays which form an anti-interference array in a specific arrangement mode to receive satellite signals from the front surface of a structure carrier and complete an anti-interference function, the interference signals are inhibited through a zeroing algorithm, and the back surface of the lower half part of the conical missile-borne structure body comprises an antenna array which is used for receiving the satellite signals from the back surface of the structure. The projection of an angle formed by the main radiation directions of the first active antenna array and the second active antenna array on the cross section of the circular truncated cone forms a 90-degree right angle, the spacing between the array elements is enlarged, the coupling effect between the antenna arrays is inhibited, the adaptability of an anti-interference algorithm is ensured, the fourth active antenna array is used for receiving satellite signals from the lower half part, and the projection of the angle formed by the fourth active antenna array and the main radiation direction of the third active antenna array on the longitudinal section of the circular truncated cone forms a 29.2 degree angle;
3. the antenna radiator is arranged in the antenna housing, so that the size of the antenna radiator can be further reduced in a compact environment; the outer surface of the antenna housing and the outer surface of the conical missile-borne structure are designed in a coplanar manner, so that the arrangement space of the 3+1 anti-interference array antenna is greatly optimized;
4. the probe at the input end of the antenna feed network board is welded at a welding hole position reserved on the low-noise amplifier PCB, so that signals received by an antenna array can enter the low-noise amplifier to realize the functions of amplification, filtering and the like, and the low-noise amplifier PCB can inhibit the electromagnetic interference of an active part link through the lower shielding case 2;
5. the antenna radiation patch slotting design increases the effective resonance length under the condition of not increasing the space size of the radiation patch, and achieves the purpose of designing the required frequency by controlling the slotting length of the copper-clad area of the antenna radiation patch;
6. according to the invention, the antenna housing, the low-noise PCB and the shielding housing are fixed on the surface of the conical missile-borne structure body by adopting the two metal pressing blocks, and the metal pressing blocks can adjust the inconsistency of structural asymmetry to amplitude phase and frequency of two paths of orthogonal signals besides the fixing action, so that the antenna array has better circular polarization characteristic.
Drawings
Fig. 1 is a schematic diagram of the arrangement of active antenna arrays on a conical missile-borne structure when the conical missile-borne structure of the invention is vertically positioned;
fig. 2 is a schematic diagram of the arrangement of active antenna arrays on a conical missile-borne structure when the conical missile-borne structure is horizontally placed according to the invention;
fig. 3 is a first diagram of the position relationship of the active antenna array of the present invention 4;
fig. 4 is a second diagram of the position relationship of the 4 active antenna elements of the invention;
fig. 5 is a schematic diagram of the structure of an active antenna array of the present invention;
fig. 6 is a schematic diagram of an exploded structure of an active antenna array according to the present invention;
fig. 7 is a schematic diagram of the antenna radiation patch structure of the present invention;
the antenna comprises a conical missile-borne structure body 1, a conical missile-borne structure body 1-1, a circular truncated cone 2, a shielding cover 3, an antenna housing 4, an antenna feed network board 5, an antenna radiator 6, an antenna radiation patch 7, a metal pressing block 8, a first active antenna array 9, a second active antenna array 10, a third active antenna array 11, a fourth active antenna array 12 and a feed pin.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
a miniaturized anti-interference antenna array comprises a conical missile-borne structure body 1, wherein a circular truncated cone 1-1 in the middle of the conical missile-borne structure body 1 is an array distribution area of an active antenna array, the radius of an upper table top of the circular truncated cone 1-1 is 41.3mm, the radius of a lower table top of the circular truncated cone 1-1 is 54.5mm, and the height between the upper table top and the lower table top of the circular truncated cone 1-1 is 55 mm. In order to reduce the spatial range required by the active antenna array arrangement under the structure, the active antenna array is arranged on the conical missile-borne structure in a 3+1 arrangement mode and is designed to be conformal to the surface of the conical missile-borne structure, the spatial range required by the active antenna array arrangement under the structure is effectively reduced, the problem that the anti-interference antenna array under the conical missile-borne structure needs self-adaptive selection due to carrier shielding is solved or partially solved, and the active antenna array arrangement method has profound significance for researching the arrangement mode under similar application scenes.
The specific arrangement form of the active antenna array is shown in fig. 1-2, under the condition that the axis of the circular truncated cone 1-1 is horizontally placed, the upper half part of the horizontal tangent line of the axis of the circular truncated cone 1-1 is provided with 3 active antenna arrays which are arranged in an isosceles triangle manner, the satellite signal from the front side of the conical missile-borne structure body 1 is received, the interference signal is suppressed through a zeroing algorithm, the active antenna array arranged on the lower half part of the horizontal tangent line of the axis of the circular truncated cone 1-1 is the fourth active antenna array 11, and the satellite signal from the back side of the conical missile-borne structure body 1 is received.
The three active antenna arrays (3) on the upper half part of the horizontal tangent of the axis of the circular truncated cone 1-1 are respectively a first active antenna array 8, a second active antenna array 9 and a third active antenna array 10, the third active antenna array 10 is placed at a position close to the upper table top of the circular truncated cone 1-1, and the first active antenna array 8 and the second active antenna array 9 are placed at a position close to the lower table top of the circular truncated cone 1-1.
As shown in fig. 3, the projection of the angle formed by the main radiation directions of the first active antenna array 8 and the second active antenna array 9 on the cross section of the circular truncated cone 1-1 forms a 90-degree right angle, the array element interval is enlarged, the coupling effect between the antenna arrays is inhibited, and the adaptability of an anti-interference algorithm is ensured. The first active antenna element 8 and the second active antenna element 9 are symmetrically arranged about the axis of the circular truncated cone 1-1.
As shown in fig. 4, the fourth active antenna element 11 and the third active antenna element 10 are disposed vertically symmetrically, and a projection of an angle formed by the main radiation directions of the fourth active antenna element 11 and the third active antenna element 10 on the longitudinal section of the circular truncated cone 1-1 is 29.2 °.
As shown in fig. 5 to 6, the first active antenna array 8, the second active antenna array 9, the third active antenna array 10 and the fourth active antenna array 11 are independent active antenna arrays, the active antenna arrays include a shielding case 2 fixed on the conical missile-borne structure 1 and in an inverted "convex" shape, and a radome 3 located above the shielding case 2 and in a "convex" shape, an antenna feeding network board 4 is arranged between the shielding case 2 and the radome 3, a low-noise PCB is arranged in the shielding case 2, the upper surface of the low-noise PCB is connected with the lower surface of the antenna feed network board 4 in a welding way to ensure common ground, in particular, a probe at the input end of the antenna feed network board 4 is welded at a welding hole position reserved on the low-noise PCB, so that the signals received by the antenna array can enter a low-noise amplifier to realize the functions of amplification, filtering and the like, and the low-noise PCB can inhibit the electromagnetic interference of the active part link through the shielding case 2 below.
The upper part of the antenna housing 3 and the outer surface of the conical missile-borne structure body 1 are in coplanar design, and the arrangement space of the 3+1 anti-interference array antenna is greatly optimized. A groove with a square cross section is formed in the center of the bottom of the antenna housing 3, an antenna radiator 5 is arranged in the groove in a sealing mode, the antenna radiator 5 is a cuboid completely sunk into the groove, and the size of the antenna radiator 5 can be further reduced in a compact environment; there is a certain gap between the antenna housing 3 and the antenna radiator 5, which plays a role in protecting the antenna. Antenna housing 3 pastes antenna radiator 5 in this patent, has increased the influence of antenna housing 3 to the frequency characteristic of antenna, and the dielectric constant 22 of antenna radiator 5 medium is the biggest section panel of TP series dielectric constant, by microstrip antenna sizeTheoretical formula
It can be seen that the size of the active antenna element and the effective dielectric constant of the medium
In inverse proportion, the size of the antenna radiation plate is greatly reduced. In the concrete implementation, after a proper debugging method is adopted, the effect of reducing the radiation frequency of the antenna can be achieved, and the effect of reducing the size of the antenna can be achieved to a certain extent through the reverse reasoning of the theoretical formula of the size of the microstrip antenna.
The outer surface of the upper part of the antenna radiator 5 is provided with a square antenna radiation patch 6, the copper-covered area of the antenna radiation patch 6 is slotted, four sides are slotted respectively, slots on two groups of parallel sides are slotted symmetrically respectively, namely, the slots are the same in length, and slots on two sides which are perpendicular to each other are slotted asymmetrically, namely, the slots are different in length. Under the condition that the space size of the radiation patch is not increased, the effective resonance length is increased, and the purpose of designing required frequency is achieved by controlling the length of the copper-clad area slot of the antenna radiation patch 6.
As shown in fig. 7, the antenna radiation patch 6 is provided with a plurality of feed pins 12, the feed pins 12 are located on a circle with the center of the antenna radiation patch 6 as a center and with equal radius, and the input impedance of the antenna is adjusted by adjusting the radius of the circle, and the input impedance of the antenna is usually 50 ohms. The angle of a sector area swept by the center of the antenna radiation patch 6 and the positions of any two adjacent feed pins 12 is 90 degrees, and meanwhile, the connecting line of the center of the antenna radiation patch 6 and any one feed pin 12 is respectively vertical to the corresponding edge of the antenna radiation patch 6. The antenna multi-feed-point design realizes circular polarization through the antenna feed network board 4, and has higher phase center stability, more symmetrical directional diagram, wider lobe width and standing wave bandwidth compared with the design of a single feed point.
The antenna feed network board 4 plays a role in transmitting an antenna receiving signal to a low-noise amplifier, is positioned below the antenna radiator 5 and above the low-noise amplifier PCB, and plays a role in fixing an antenna and the low-noise amplifier, the antenna feed network board 4 adopts a 3dB bridge designed by a microstrip line, output signals of an output port are orthogonal signals with equal amplitude and 90-degree phase difference, the signals are transmitted to the antenna radiation patch 6 through the feed pin 12, the 90-degree orthogonal constant amplitude signals are formed on the surface of the antenna radiation patch 6, and the transmission mode of a field emitted by an antenna array is adjusted to right-hand circular polarization by controlling the lead and lag of the phase.
Two short edges of the antenna housing 3 are provided with grooves, metal pressing blocks 7 are arranged at the grooves, the antenna housing 3, the low-noise PCB and the shielding housing 2 are fixed on the surface of the conical missile-borne structure body 1 through the two metal pressing blocks 7, and the antenna housing, the low-noise PCB and the shielding housing 2 are fixed on the conical missile-borne structure body 1 through four pan head screws M2.5. Besides the fixing function, the metal pressing block 7 can adjust the inconsistency of the structural asymmetry to the amplitude phase and the frequency of two paths of orthogonal signals, so that the antenna array has better circular polarization characteristic.
The active antenna array integrates multifunctional devices including an antenna radiator 5, an antenna radiation patch 6, an antenna feed network board 4, a low-noise PCB, a shielding case 2, an antenna housing 3 and a metal pressing block 7, so that the physical size of the active antenna array is reduced, the integration level is increased, and the antenna performance is improved; the active antenna array adopts a 3+1 arrangement form to be installed on the conical missile-borne structure body and is in conformal design with the surface of the conical missile-borne structure body, the space range required by the arrangement of the active antenna array under the structure is effectively reduced, the problem that the anti-interference antenna array under the conical missile-borne structure needs to be selected in a self-adaptive mode due to carrier shielding is solved or partially solved, and the active antenna array has profound significance for researching the arrangement mode under similar application scenes.
Claims (7)
1. A miniaturized, interference-free antenna array, comprising: the antenna array comprises a conical missile-borne structure body (1), wherein a round table (1-1) at the middle part of the conical missile-borne structure body (1) is an active antenna array distribution area, the upper half part of a horizontal tangent line of the axis of the round table (1-1) is provided with 3 active antenna arrays arranged in an isosceles triangle manner, the lower half part of the horizontal tangent line of the axis of the round table (1-1) is provided with 1 active antenna array, 4 active antenna arrays are arranged on the conical missile-borne structure body (1) and are in conformal design with the outer surface of the conical missile-borne structure body (1), each active antenna array comprises a shielding cover (2) which is fixed on the conical missile-borne structure body (1) and is inverted in a convex shape and an antenna housing (3) which is positioned above the shielding cover (2) and is in a convex shape, and an antenna feed network board (4) is arranged between the shielding cover (2) and the antenna housing (3), the shielding case (2) is internally provided with a low-noise PCB (printed circuit board) and the upper surface of the low-noise PCB is connected with the lower surface of the antenna feed network board (4) in a welding way, a probe at the input end of the antenna feed network board (4) is welded at a welding hole position reserved on the low-noise PCB, the center of the bottom of the antenna housing (3) is provided with a groove with a square cross section, an antenna radiator (5) is closely connected in the groove, the antenna radiator (5) is a cuboid completely sunk in the groove, the outer surface of the upper part of the antenna radiator (5) is provided with an antenna radiation patch (6), four edges of the antenna radiation patch (6) are respectively slotted, two groups of slots on parallel edges are respectively symmetrically slotted, two mutually vertical edges are slotted asymmetrically, and the upper part of the antenna housing (3) and the outer surface of the conical spring-loaded structure body (1) adopt a coplanar design, the antenna housing is characterized in that grooves are formed in two short edges of the antenna housing (3), metal pressing blocks (7) are arranged in the grooves, and the metal pressing blocks (7), the antenna housing (3) and the antenna feed network board (4) are fixed on the conical missile-borne structure body (1) together through screws and the shielding housing (2).
2. A miniaturized, interference free antenna array as defined in claim 1, wherein: the radius of the upper table surface of the circular table (1-1) is 41.3mm, the radius of the lower table surface of the circular table (1-1) is 54.5mm, and the height between the upper table surface and the lower table surface of the circular table (1-1) is 55 mm.
3. A miniaturized, interference free antenna array as defined in claim 2, wherein: the antenna comprises a circular truncated cone (1-1), and is characterized in that 3 active antenna arrays arranged on the upper half part of a horizontal tangent of the axis of the circular truncated cone (1-1) are respectively a first active antenna array (8), a second active antenna array (9) and a third active antenna array (10), the third active antenna array (10) is placed at a position close to the upper table surface of the circular truncated cone (1-1), the first active antenna array (8) and the second active antenna array (9) are placed at a position close to the lower table surface of the circular truncated cone (1-1), the projection of the angle formed in the main radiation direction of the first active antenna array (8) and the second active antenna array (9) on the cross section of the circular truncated cone (1-1) is a 90-degree right angle, and the first active antenna array (8) and the second active antenna array (9) are symmetrically placed about the axis of the circular truncated cone (1-1).
4. A miniaturized interference free antenna array according to claim 3, characterized in that: the active antenna array that the horizontal tangent line the latter half of round platform (1-1) axis set up is fourth active antenna array (11), fourth active antenna array (11) and third active antenna array (10) longitudinal symmetry place, the projection of the angle that the main radiation direction of fourth active antenna array (11) and third active antenna array (10) formed on round platform (1-1) longitudinal section becomes 29.2.
5. A miniaturized, interference free antenna array as defined in claim 1, wherein: the antenna radiation patch (6) is provided with a plurality of feed pins (12), the feed pins (12) are positioned on a circle which takes the center of the antenna radiation patch (6) as the center of a circle and has equal radius, the angle of a sector area swept by the center of the antenna radiation patch (6) and the positions of any two adjacent feed pins (12) is 90 degrees, and meanwhile, the connecting line of the center of the antenna radiation patch (6) and any feed pin (12) is respectively vertical to the edge of the corresponding antenna radiation patch (6).
6. A miniaturized, interference free antenna array as in claim 5, wherein: the antenna feed network board (4) adopts a 3dB bridge designed by microstrip lines, the output signals of the output ports are orthogonal signals with equal amplitude and 90-degree phase difference, and the signals are transmitted to the antenna radiation patch (6) through the feed pins (12), so that the orthogonal 90-degree equal-amplitude signals are formed on the surface of the antenna radiation patch (6).
7. A miniaturized, interference free antenna array as defined in claim 1, wherein: the dielectric constant of the antenna radiator (5) medium is 22.
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